C4 vs C5 brake booster question

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The Artist formerly known as Turbo84
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Mar 30, 2008
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Clinging to my guns and religion in KCMO.
I weighed a C4 and a C5 booster recently, and the (plastic) C4 booster is noticably lighter that the (metal) C5 booster. Anybody know why Chevrolet went with the heavier steel part? Was it cost? Or, was there a packaging issue (the C5 unit is smaller diameter than the C4 part)? Durability?

Just curious.
 
Probably has to do with engine heat? Also, 84s have a steel booster too...1 year bastards LOL
 
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